Method of chipping glass.



V UNITED STATES PATENT OF CE.

JOHN L. DAWES AND WILLIAM F. HULL, OF PI TTSBURG,.PENNSYLVANIA; SAID HULL ASSIGNOR TO SAID DAWES.

METHOD OF CHIPPING GLASS.

SPECIFICATION forming part of Letters Patent No. 693,243, dated February 11, 1902.

Application filed April 13, 1901- Serial No. 55,777- (No specimens.)

To all whom it may concern:

Be it known that we, JOHN L. DAWEs and WILLIAM FRANK HULL, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Method of Chipping Glass, of which the following is a full, clear, and exact description.

Ourinvention relates to the method of orna menting glass by chipping wherein a glue compound is applied to the surface; and the object of the invention is to cheapen the operation, especially where applied to chipping glass around a design or to chipping glass within the design, leaving the glass plain around the design, and, further, to enable the chipping to be carried to an exact line and avoid the ragged appearance commonly made at the edge of the chipped portions.

In carrying out our improved process in its preferred form we take a sheet of glass of any desired size and coat the same with a sticky compound to which paper will adhere. We then lay a sheet of paper upon the sticky coating and smooth it down. lVe then coat the surface of the paper with a sticky substance, preferably a whiting compound, such as whiting and glue. This coating is allowed to dry, and a second similar coating is then preferably added over the first coating and it in turn allowed to dry; When these two coats have dried, the plate is ready to receive the transfer, and in obtaining this transfer the desired design may be sunk in a plate of any suitable material-such as copper, steel, glass, or zinc. The ink being applied to the plate, the surplus ink is removed and the paper applied. This paper picks up the ink in the sunken portions and is applied to the prepared glass plate on the top of the coatings,and the transfer-paper is then peeled off or removed. We then wash away the several coatings and the paper from all parts of the glass surface except beneath the inked portions by brush-and-water treatment or in any other suitable way and leave the glass surface bare except for these inked portions. If the design itself is to be chipped, the coatings and paper will be washed away around the design. If, on the other hand, thechipping is to be made around the design, the ink is spread around the design correspondingly,

is inked within the design, this design will be removed, leaving the glue covering the parts of the plates around the design, or if the ink is applied around the design the glue will remain in the design, the paper and compounds then being peeled away around it. The plate or sheet of glass thus prepared is then allowed to dry, and the glue peels from the roughened portions, thus chipping the glass and giving the desired ornamental elfect.

The advantages of our invention lie in the cheapness andrapidity with which the chipping operation may be carried out and, further, from the chipping to a smooth line along the lines of the design. The process is found in practice to give excellent results and does away with needle-cutting of designs from paper on the glass or similar slow and expensive steps.

Many changes may be made in the steps of our process, as wellas in the inks and compounds used, without departing from our invention.

We claim- 1. The method of chipping glass, consisting in securing paper thereto, applying a coating to the paper, applying an ink-transfer to the coating, removing the paper except beneath the inked portions, and then sand-blasting and applying the glue coating; substantially as described.

2. The method of treating glass, consisting in securing paper thereto by a sticky compound, applying a transfer to the paper, removing the paper and its sticking compound in the parts to be chipped, and then sandblasting .and applying the glue compound; substantially as described.

3. The method of chipping glass, consisting in applying a sticky coating to the glass, applying a'paper' to the sticky coating, coating the paper, applying a transfer over the paper coating, removing the paper and coatings to expose the glass in the parts to be chipped, and then sand-blasting and applying a glue coating; substantially as described.

4. The method of chipping glass, consisting in applying a sticky coating, laying a sheet of paperover the coating, applying a coating of Whiting compound to the papely applyiug a transfer to the coating of whiting, washing away the paper and coating except beneath I the inked portions, and then sand-blasting and applying a glue coating and removing the paper and compound; substantially as described.

| In testimony whereof We have hereunto set 1 our hands.

I JOHN L. DA'WES.

-WILLIAM F. HULL.

Witnesses:

L. M. REDMAN, GEO. B. BLEMING. 

